.then execution of actions following a future's completion

[dancollins34]

BPO	32672
Nosy	@bitdancer, @asvetlov, @1st1, @dancollins34
PRs	Fix version in AppVeyor #5535 bpo-32672: Add then execution for chaining python futures issue #5335

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2018-05-28.20:04:09.589>
created_at = <Date 2018-01-26.04:04:24.992>
labels = ['type-feature', '3.8', 'expert-asyncio']
title = ".then execution of actions following a future's completion"
updated_at = <Date 2018-05-28.20:04:09.588>
user = 'https://github.com/dancollins34'

bugs.python.org fields:

activity = <Date 2018-05-28.20:04:09.588>
actor = 'yselivanov'
assignee = 'none'
closed = True
closed_date = <Date 2018-05-28.20:04:09.589>
closer = 'yselivanov'
components = ['asyncio']
creation = <Date 2018-01-26.04:04:24.992>
creator = 'dancollins34'
dependencies = []
files = []
hgrepos = []
issue_num = 32672
keywords = ['patch']
message_count = 4.0
messages = ['310730', '310731', '310733', '317703']
nosy_count = 4.0
nosy_names = ['r.david.murray', 'asvetlov', 'yselivanov', 'dancollins34']
pr_nums = ['5535', '5335']
priority = 'normal'
resolution = 'rejected'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue32672'
versions = ['Python 3.8']

[dancollins34]

To my knowledge, python currently has no capability to chain future execution, requiring another future to begin executing with the result from the first.

I have submitted a pr to enable this functionality with a .then(self, fn) method on the concurrent.futures.Future object.

-dancollins34

[bitdancer]

I think this requires a discussion on the python-ideas mailing list, since API changes to Future need consideration in the asyncio context as well.

[dancollins34]

Okay, I'll post something.

[1st1]

Closing this one. I don't see us adding Future.then. Feel free to discuss on the MLs.